Reverse-gear transmission



42 Sheets-Sheet 1 Filed Aug. 8, 1940 QW M\ INVENTOR fha/274.5 Z .Fifa/B Wage/Mofa?.

ATTORNEY Dec- 7, 1943 T. 1 FAw|K 2,335,926

' REVERSE-GEAR TRANSMISSION Filed Aug. 8. 1940 2 Sheets-Sheet 2 j? 6 ya r j (I 129 ,a2 (wa f 40 F'zg. 5 INVENTOR 7/70/7745 .4. Fam/3 ATTORNEY -ripnery is secured to the l0.- il and at its inner periphery is provided with Patented Dec. 7, 15943 UNITED s'rA'rEs PATENT OFFICE I REVERSE-GSRZNSMISSION Thomas L. Fawlck, Akron, Ohio Application August 8,1940. Serial No. 351.874

3. Claims. (Cl. 'I4-377) This invention relates to reverse gear transmissions. Some-oi the features disclosed in the present application are more broadly described an oil-*seal isI sealing against the-outer face or the sleeve l0 for preventing escape of oilfrom and claimed in my United states patent No.

2,187,967, granted January 23, 1940, an application for the reissue of which was led on April 22,

1940, Serial No. 331,060, which resulted in Reissue- Patent No. 21,630, granted Nov. 26, 1940.l

, The chief objects of the present invention are to provide simplicity of construction, compactfness, ease of assembly and disassemblyfand effective exclusion of dirt, water and other foreign matter from the bearings, clutches and gearing: to provide those advantages in commotion with speed reduction; and'toA provide improved fricthe gear case and entrance of foreign matter into it. f

ASlip-splined upon thestubshaft i5 is the hub of a rotary member 2l which at its outer periphery has secured thereto by means of bolts 2| and tion-clutch means and positive clutchfmeans in" combination, the friction-clutch means being adapted not only to synchronize the positive- `clutch means, but also on occasion to sustain the full driving load, which isdesirable in marine service, for example, for starting' and maneuvering the craft by friction clutch means and then bringing the positive-clutch means into effect for sustained driving. z

Of the accompanying drawings:

Fig. 1 is a longitudinal, vertical, middle-section of a reverse-gear transmission embodying my invention in its preferred form.

Fig. 2 is a corresponding vie'w, on a larger scale,

of parts of the mechanism as shown in Fig. 1.

' Fig. 3 is a perspective view, with parts in section, of some of thev parts that are shown in Fig. 2. Fig. 4 is a fragmentary face lview of some of the parts that are shown in Fig. 3.4

Fig. 5 is an axial section of some of the parts that are shown in Fig. 1 and of a reverse-idler assembly associated therewith,

Referring to the drawings, the assembly comprises a gear case I0 having a centering and attahment flange Il adapting it to be secured to nal webs of the gear case by means of radial-andthe frame or housing of a motor, of which the 'crank-shaft is shown at i2 and the ily-wheel at Il.

Secured inaxial alignment with the. crank- @shaft I2, permissibly by the same bolts, I4, i4,

which secure the fly-wheel to the crank-shaft, is

a splined stub-shaft I5 which functions as an extension of the crank-shaft. A cylindrical sleeve memberv il is a't one of its ends press-ntted upon a shoulder formed upon the stub-shaft i5 and is thus adapted to rotate in the central aperture of an endclosure. plate il which at its outer Degear case Il by bolts 'on a ring 2l which issecured by bolts Il and dowels 2l* to the head of a reverse-drive shalt 2l which is iournaled at its far end in the rear wall of the gear case Il, by means of a radial-andthrust bearing 20, and at its near end isioumaled. by means of a radial-and-thrust bearing 30,' in a forwarddrive menber 3i which is splined upon a forward-drive quill 32 surrounding the reversedrive shaltl 2l, the quill being iournaled in interthrust bearings I3, 34 and formed with a directdrive pinion 3l which isdn constant mesh with a gear I0 secured upon a driven shaft 31 suitably journaled in the case il and formed at its rear end with a head ll* adapting it to ybe secured,

either directly or through intermediate means such. as a fluid-actuated clutch (not shown) with a driven member such as the propeller-shaft of a boat. The shaft 01 may be axially bored and provided with nuid connections such as an alr-v seal 38 and anuid-supply line Il, preferably leading from the same source of fluid supply as the pipesy I! and 0l hereinafter described. for actuating suchfa clutch.

Secured upon the vreverse-drive shaft 20 is a pinion 40 which is constantly meshed with one pinion, 4|, of a pair of twin idler pinions Il, 4!

(Fig. 5), of which pinion 42 is constantly meshed with the gear 3l.

The arrangement as thus described is such that the forward-drive quill 32 -and the reverse-drive shaft 20 must always rotate in opposite directions.

For positive forward drive of the forward-drivequill 32 the internal clutch-teeth 24 of the clutch member 22` are adapted to mesh with external clutch-teeth 43 formed on a ringJ 44 which is secured by bolts 4I and dowels 4I* upon the splined member 3|. f

For moving the clutch member 22 axially of the assembly for selectively meshing its clutchteeth 23 with the teeth orfits teethf-M with.

. ment.

the' teeth 43, or through a less range for selective engagement only o f friction-clutch members `presently to be described, the hub of the member The sude block 41 is' Aformed with a threaded, 10

axially disposed bore extending to the transverse ybore in which the pin 46 is mounted and the pin .is formed with a conical recess 50 adapted to receive the conical end of a rod which extends through an axail bore in the reverse-drive shaft 28 and is threaded into the threaded hole of the slide block 41, this arrangement being adapted for easy assembly with secure holding of the pin against lengthwise sliding movement.

At its rear end the rod 5I is' swiveled in one 20 arm of a two-armed lever 52 which is fulcrumed at 53 .in a forked' bracket l54 projecting from an end-closure plate 55 which is suitably secured to the gear case y l0 and provided with oil-seals 55",

56 for the driven shaft 31 and the clutch-actu- 25 The other arm o f the lever 52 is forked and has pin-and-slot connection with the piston rod 51 of a clutch-actuating two-Way cylinder 58 the adjacentfrictlon-clutch and jaw-clutch members rotating at the same speed.

Further axial movement of the jaw-clutch,y

member 22 in the same direction then causes the stud 81 to slide out of the bay 66, along the obliquely disposed wall of the latter, and to enter the adjacent bay 66", in which it is positively interlocked against relative rotary movement, and this operation brings the clutch-teeth into mesh.

Movement of the clutch member 22 back to its middle position unmeshes the clutch teeth and permits the friction clutch member 63 to return to middle position, where it is held by the stud 61 entering one or the otherof the bays 68, according to relative speeds as determined by external and internal frictional contacts of the ring assembly 63, 65, until the member 22 is again moved from its middle position.

To assure a suiiiciently strong drag of the floating cone-clutch structure along with the jawclutch member in the latters axial movement to obtain initial frictional driving engagement strong enough to cause the stud 61 to enter the bay 58* as above described, a spring backed ball-detent 89 is mounted in a recess in the stud 61 and is adapted to coact with the walls o'f a short mounted upon the gear case- I0 and provided with -30 supply-exhaust pipesSS, 60.

The friction-clutch means above referred to comprises inner cone-clutch members 6|, 82.sev cured respectively upon the head of the reversedrive shaft 28 and upon the forward-drive mem- 35 ber 3| and tapered toward each other, and an outer cone-clutch ring 63 formed with oppositely ared internal faces adapted to be brought into engagement with the cone-clutch membersy 6I and 62 selectively by relative axial move- 40 -axial direction, deeper bays 66h, 65h adapted to receive with a snug fit and with a positive interlock against relative circumferential movement four adjacent sides of the hexagonal. stud 81.

The stud 61 Jis mounted in a complemental hex-Y agonal hole in the jaw-clutch member 22 and retained therein by a snap-ring 88. 4 Thisarrangement is such that when the iawclutch member 22 is being driven and is in its middle, neutral position, with its teeth' out. of 60 mesh, it will carry the stud'into one of the trapezoidal bays 88' and thus compel the frictionclutch ring 63 to rotate with it. Axial movement of the Jaw-clutch member then causes the friction clutch member to move with it and engroove 10 formed in the floor of the recess 66, that floor being the outer face of the member 83, this detentbeing adapted to hold the two .structures in medial alignment or symmetrical Vrelation when they are not being so held by the 'assembly will be manifest upon contemplation of the drawings.

It may be noted, for example, that the four coaxial structures inclusive respectively of the members 28, 32, 3| and 22 can be readily associated with their bearings and with each other by relative axial movement and then by relative axial movement, they as a unit can be readily Amounted in the gear case. Thereafter, they and Various modifications are possible within the scope of the invention as defined by the appended claims.

I claim:

l. A reverse-gear transmission comprising 'a driving shaft, a driven shaft, and forward and reverse driving means interposed koperatively between the two, said means comprising coaxial forward and reverse shafts one within the other. gearing connecting the forward and reverse shafts 5 and compelling them to rotate in opposite. di-

gage and drive one or the other, according to the direction of axial movement, of the frictionclutch members il, 62, before it has been moved so far as' to engage its clutch teeth 23 or` 24, with the driven structure, the angle of the side walls-V of the bay 86* preferably being such as to compel the friction-clutch member 63 to move axially with the jaw-clutch member 22 until the friction clutch members sustain full drivingnload, with 75 rections, juxtaposed, axially engageable clutch members on the said coaxial shafts respectively, axially-engaging clutch means slidablyV but nonrotatably mounted on'one of the two first-mentioned shafts and adapted to be engaged selectively with the said clutch members by relative axial movement, and mechanical clutch-actuating means extending. lengthwise through the coaxial shafts for effecting such engagement, the shaft on-which said clutch means is mounted ing means comprising a member slidably mounted in said bore and said slot.

2. A reverse-gear transmission comprising coi axial forward and reverse shafts one'within the other, gearing connecting the forward 4and reverse shafts and compelling them to rotate in opposite directions, juxtaposed clutch members on said shafts respectively; a clutch structure adapted to be engaged selectively with'the said clutch members and including a, splined hub, a

frame structure supporting all of the said parts as a portable unit, said frame being provided with means for securing it to the frameof a motor, and the'vsaid splined hub being adapted to fit onto a shaft of the motor when the said unit -is presented to the frame of the motor.

3. A reverse-gear transmission Aoomprising'a transmission housing and a. reverse-'gear therein incl'uding a hub member having open-end, slipconnection, driving means adapting it to be connected to a shaft of a motor in driving relation' thereto by simple axial sliding movement, the housing including an end-closure member having an opening coaxial with said hub member, in combination with va. motor shaft having, in fXed relation thereon, open-end slip connection, driving means mating with said hub "member, and having in xed relation thereon closure means tting into the opening of said end-.closure mem' ber, by simple, axial, sliding movement.

THOMAS L. FAWICK. 

